membrane basics Flashcards
1
Q
state the three roles of biological membranes
A
- barrier
- site of chemical reactions
- cell signalling
2
Q
how do biological membranes act as a barrier?
A
partially permeable (lipid so no water soluble substances can pass)
- separates organelles and cytoplasm
- separates cell and external environment
- separates organelles
3
Q
how do biological membranes act as a site of chemical reactions?
A
keeps metabolic processes in place
4
Q
how do biological membranes act as a site of cell signalling?
A
recognises and allows cells / substances to pass, send signals and receive info
- moves within bilayer and activates other molecules that release water soluble molecules that bind to receptors
